Red star borders

[Forum_2018]

Dear All

Is it possible to reduce the red star borders?

Best Regards
Stefan

[Forum_2018]

Hello Stefan, the halos caused by the glass optics seems normal to me. Compare it to this image:

www.astroeder.com/b33_eder_en.html

Instead, the overall background seems too bright and too reddish, this should be corrected and made similar to that image.

Best regards,
Fabio.